[PATCH] rtc: Modify leap year test for more simpler way

[Jonghwa Lee]

Leap year which is multiple of 4, just needed 2 LSB for verifying.
A year with zero for all thease two bits means that it is leap year.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
---
 include/linux/rtc.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 9531845..d662b8d 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -181,7 +181,7 @@ void rtc_timer_do_work(struct work_struct *work);
 
 static inline bool is_leap_year(unsigned int year)
 {
-	return (!(year % 4) && (year % 100)) || !(year % 400);
+	return !(year & 0x3);
 }
 
 #ifdef CONFIG_RTC_HCTOSYS_DEVICE
-- 
1.7.9.5

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